The Cascade Mall shooting suspect, Arcan Cetin, may face an additional investigation related to his voting record and citizenship status.

Federal sources confirm to KING 5 that Cetin was not a U.S. citizen, meaning legally he cannot vote. However, state records show Cetin registered to vote in 2014 and participated in three election cycles, including the May presidential primary.

Cetin, who immigrated to the United States from Turkey as a child, is considered a permanent resident or green card holder. While a permanent resident can apply for U.S. citizenship after a certain period of time, sources tell KING his status had not changed from green card holder to U.S. citizen.

While voters must attest to citizenship upon registering online or registering to vote at the Department of Licensing Office, Washington state doesn’t require proof of citizenship. Therefore elections officials say the state’s elections system operates, more or less, under an honor system.

“We don’t have a provision in state law that allows us either county elections officials or the Secretary of State’s office to verify someone’s citizenship,” explained Secretary of State Kim Wyman. “So, we’re in this place where we want to make sure we’re maintaining people’s confidence in the elections and the integrity of the process, but also that we’re giving this individual, like we would any voter, his due process. We’re moving forward, and that investigation is really coming out of the investigation from the shootings.”

A screenshot of the alleged gunman’s Facebook page. Although media reports described him as Hispanic, his page says he is originally from Turkey. (Facebook/Arcan Cetin)

On the Tumblr page, a post contains a reference to Allah and a person who responds uses the word Jannah, which is the term for the Muslim paradise.